Annealing pot



v Oct. 4, 1938. V, G, BATES 2,131,931

ANNEALING POT Filed Jan. 9. 1937 Patented Oct. 4, 1938 This inventionrelat A A,toannealingpots and the primary .Objectis to.; enable such pots t ,be .stackedone upon the;ctlrier` in; use without ,subastantial likelihood offfthegstacked-pots becoming l5 pdisarranged, especially.` during handlingv thereof.

f 4The `patent `to `Stewart l'fifiy relates, to, annealing pots constructed and arranged-,to provide, aniongiother things; fan increase in the area of the bearing seats thereon so that pots, including those which were warped, could be stacked substantially and safely. Another important object of the present invention is to improve the pots of the Stewart patent so that not only unaltered as well as warped pots maybe stacked substantially and safely but also to enable substantial and safe stacking of pots which have grown in use.

Annealing pots are customarily used as long as can be done safely but those pots which can no longer be used safely are replaced with new pots. The result of this is that often in a collection of annealing pots there is an intermixture of pots of which some will be but newly placed in service and of which others will have been in service for appreciable periods. It is known that the pots grow, that `is to say, the dimensions thereof increase, in service and it is more or less accurate to state that vthe extent of growth of a pot is directly proportionate to the length of service of the pot. i

This growth in pots as stated .increases the dimensions thereof and causes the bearing seats in the pots to spread outwardly. It has been found in practice that this growth may take place to such an extent that when it is attempted to stack one pot on the bearing seats of another pot, the bottomrof the upper pot'will not contact, at least not properly, the bearing seats of the lower pot. Thisr is particularlyy true when it is attempted to stack a new pot on the bearing seat of a pot in which there had been appreciable growth. Hence, a specic object of this invention is to so increase the size of the bearing seats in annealing pots that' the pots may be safely stacked one upon the other even though there has been `appreciable growth in some or all of the pots.

While it is advantageous to increase the area of the shoulder or bearing seats provided on annealing pots to enable the pots to be stacked one upon the other safely under all conditions, it is also essential thatthe weight of the pots be kept down as much as possible for annealing pots are of necessity rather heavy and any excess or unnecessary weight added therein increases 55 the difliculties encountered in handling thereof.

Por i tes, Chicag {AmericanBrake Shoe and FoundryV Compan Wil1nihg`ton, 1li)e`l.,^a corporation ofiDelaware "Appnationjaiiiiaiyb, 1937, serial no flasor. l,

" Lremitir,y (o1. ac3-49) ',Il'husvlstill anothe ob increase the area of t in,,annealing pots with tl ubstantiallyincreas- .nstheweightfiii A @elated ,embfdm n? Off illustrated iriilieaomp @Yin 44Figui is a top, pla

Fig. 3 is a fragmentary top plan vewfdrawn to an enlarged scale, of one corner. of my novel pot; and

Fig. 4 is a perspective detail view.

In the preferred embodiment of my invention as illustrated in the accompanying drawing the annealing pot P has the corners thereof reenforced'in accordance with the invention of the aforesaid Stewart Patent 1,685,966 which is to say that an excess of metal is provided at the inside of each corner of the pot. In Fig. 3 Ythe radius a indicates what would be the radius of the inside of the corner concentric with the radius of the Voutside corner. However, in order to providev .the excess of metal at the inside of each corner, whatis called a compensated radius, indicated by the radius b in Fig. 3, is employed, and by building up the corner on the radius b throughout the extent of each corner a crescent shape excess of metal is provided which not only takes care of the oxidation wear, which occurs more rapidly at the corners than elsewhere on the pot, but also protects the pot from cracking under the strains of expansion and contraction which occur at the corners of the pot due to the heating and cooling thereof.`

The top of the pot is ared as at 5 and is provided Vinteriorly with a shouldered seat 6 to receive the bottom of another pot when the pots are stacked one upon the other. By providing the excess of metal on the radius b at the corners of the pot the area of the shoulder or bearing seats at the'corner's is increased. It has been found in practice, however, that this increase in area of the bearing seats at the corners of the pot is not always sufficient to enable pots to be stacked safely, and this is especially true when an attempt is made to stack a new pot on a pot which has been in service for a protracted period.

In accordance with this invention, the area of the bearing seats at the corners of the pot is increased sufficiently to enable safe stacking even of a new pot on an old one. For this purpose a chordal edge 1 is provided at each corner of the thermore, it will be apparent that in order rto aiord the enlarged bearing seats 8 it is only necessary to increase the area in the plane of the shoulder seat 6. Hence the -front surface of the excess metal at each corner, in the form of a wall 9, extends from the chordal edge I toward the adjacent portions of the innervwall of the pot. The outline of the wall 9, as best shown in Fig. 4, is preferably substantially triangular and the apex thereof is arranged to converge with the inner `wall 'of theV pot well abovethe median point in the vertical extension thereof.

Thus a shelf-like portionl is provided at each corner of the pot and provides'an extension of the bearing seat at each corner.` 'I'hese shelf-like portions arethus provided by pads coni-ined to the upper yedge at eachcorner-of the pot and I thereby attain the advantage' of enlarged bearing seats without substantially increasing the weight of the pot.

While I have illustrated and described a preferred embodiment of my invention it is to be understood that this is capable of variation and modiiication and I therefore do not wish to be limited to the precise details set forth but desire to avail myself of such changes and alterations as fall within the purview of the following claim.

An annealing pot including corner portions each having a substantially horizontal ledge and said ledges providing seats on which another annealing pot may be stacked, each of said corner portions including an excess metal portion arranged on theV inner s ide of the pot and extending throughoutlatleast a substantial portion of the vertical height ofnthe same, an arc dened by the inner surface of each of said excess metal portionslying radially inwardly of and relative to an areformed by the junction of the inner surfaces of the adjacent intersecting side walls of the pot, each' of said ledges vincludingran inner suryface having-an upper'edge extending as a chord lrelative to a circle including said arc andrbetween the` inner surfaces Of'said side walls', -and the downwardly and outwardlyv froml its upper edge to itslowerend;

- inner surface of eachofsaid ledges being tapered E25 

